Campion was a well known bicycle manufacturer at Nottingham.
When they started motorcycle production, a variety of proprietary engines were used, such as Minerva, MMC, Fafnir, Precision, Villiers, Blackburne and JAP...

Parts, equipment and components were dispatched to the newly-formed C.C.M.C. (Canada Cycle Motor Company), who built and road tested a motorcycle by November of 1903. This first complete machine was then crated and dispatched for Australia by a sailing ship out of Vancouver, arriving in Townsville, Queensland, at the beginning of 1904.

Yesterdays
The firm of CF (designers Catellia and Fiorani) had started building powerful little 173 cc and 248 cc OHC face cam singles in 1928.
They were very successful in racing.
In 1937 the CF factory was taken over by the Fusi firm, which were the Italian FN importers.